METHOD FOR AND EQUIPMENT FOR SUPPRESSING DISCOLORATION OF AL-MG PRODUCTS

METHOD FOR AND EQUIPMENT FOR SUPPRESSING DISCOLORATION OF AL-MG PRODUCTS

Method and means for suppressing discoloration during thermal treatment of a product of a magnesium containing aluminium alloy, the alloy contains in wt.% Mg: 0,45 ¨ 12,0, with a preferred range of 0,45-6,0 wt%. The product, being either an extrusion billet, a sheet ingot, a cast product, or a forge...

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Bibliographische Detailangaben
Hauptverfasser: BAUGER, OYSTEIN, STEEN, IDAR KJETIL, REISO, ODDVIN, ROMFO, ALF INGE, RIST, SNORRE, PETTERSEN, TANJA, OYEN, GEIR
Format: Patent
Sprache:eng ; fre
Schlagworte:
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Zusammenfassung:Method and means for suppressing discoloration during thermal treatment of a product of a magnesium containing aluminium alloy, the alloy contains in wt.% Mg: 0,45 ¨ 12,0, with a preferred range of 0,45-6,0 wt%. The product, being either an extrusion billet, a sheet ingot, a cast product, or a forged product is heated to a temperature T where it is prone to surface discoloration and oxidation, wherein during the thermal treatment it is exposed to a suppressing atmosphere comprising 0,5-5,0% CO2 gas with a preference for 0,5 - 1,5 % CO2 gas.